Usefull python tutorial

gentlestone tibor.beck at
Wed Aug 26 13:44:25 CEST 2009

Can somebody give me an advise where I can found a really good online
tutorial? All I found are useless. For example no tutorial I found
explains this piece of code:

    someList = [element for element in otherList if element is not

or this example:

    a = a or []

There are only stupid elementary examples in the tutorials I found.

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